The geology of the Krantzberg tungsten deposits, Omaruru, SWA

Abstract

Abstract by author:

The deposits are either quartz-topaz felses or quartz-tourmaline veins with minor amounts of fluorite, mica, beryl, and traces of other accessory minerals. The economic tungsten content in the individual greisen bodies is very variable and mainly in the form of ferberite, Scheelite and powellite occur locally but are invariably very subordinate. A few smaller quartz-tourmaline veins in the vicinity of Krantzberg contain some copper sulphides beside sporadic tungsten minerals

The final stages of greisenization occur in the mine area involved silicification and sericitisation along fractures in_the Salem granite and also widespread tourmalinization in Kuiseb schist, Salem granite and the breccia on top of Krantzberg

The greisen bodies at the mine formed mainly by replacement along fracture zones in Salem granite and to a lesser extent as fracture fillings in this granite or the Kuiseb schist. There are also small replacement bodies at the base of the sedimentary breccia cliffs on the northern slope of Krantzberg mountain